8.5" GM 5.38 Ring & Pinion (NEEDS NOTCHED X/P). USA Standard ring & pinion sets are the right choice when price is a factor and quality is essential. USA Standard Gear offers a full line of ring & pinion sets for a variety of common & hard to find applications. USA standard gear offers a lower cost alternative to other manufacturers when price must be kept low. USA standard gears are not recommended for quiet running vehicles. USA standard gear offers a standard one year warranty against defects on their ring & pinion sets.